Another round of musical chairs at Microsoft. This time it's the Platforms and Services Division. The company says these changes are "further refinements" of the major shakeup last fall when its seven business units were consolidated to three.

In Windows and Windows Live Engineering, headed by Steven Sinofsky, nine executives were named to lead development of the group's priorities:

The Consumer Media Technology Group, a new team headed by Amir Majidimehr, is joining the Mobile and Embeded Devices and Communications Sector group. The CMT (that's not Country Music Television) will look for new opportunities in digital rights management for mobile operators and push Microsoft digital media in entertainment devices.

For those keeping score, that brings four business lines under the Mobile and Embeded Devices and Communications Sector group: Windows Mobile, Windows Embedded, Communications Sector, and now CMT.